Manpower.
Mohammed Ashraf doesn't go to school.
From sun-up till moonrise, he measures, cuts, shapes, punctures, and sews soccer balls, which then go rolling out from Pakistani village of Umar Kot toward the stadiums of the world.
Mohammed is eleven. He has been at this since he was five.
If he knew how to read, and could read English, he would understand the label he sticks on each of his products: "This ball was not made by children."